Improved rock-drill



danni Staten parte entre Lene/rs Patent No. 100,252, aafazMmh 1,1870.

The Schedule referred to in these Letters Patent and making part 0f the same To all whom it may concern Be it known that I, A. BLATCHLY, of Central City, and in the Territory of Colorado, have invented a new and improved Rock-Drill; and l do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings forming part of this' specification.

This invention relates to improvements inrockdrilling machines, designed to provide an automatically feeding drill, to be actuated by steam power, under a more sim pleand reliable arrangement than now in use.

The invention consists in certain improvements in the construction of the rotary engines for operating the drill, relating to the valve mechanism, pistons, bridge, or dividing-plates, and to packing the cylinders.

Also, in the combination therewith of a cam-wheel of peculiar construction for communicating a reciprocating 'movement to the drill-carriage.

Also, in an arrangement for disconnecting the prolpelling action of the cams with the drill-carriage previous to the blow ofthe drill. l

Also in an arrangement of feed mechanism for the drill, whereby automatic feed is eected;

Also, in an arrangement for imparting an intermittent rotary motion to the drill; and

Also, in an arrangementfor disconnecting the feeding mechanism for returning the drill alft-er it has been fed out for the commencement of a newhole; and

Also in an arrangement for rotating the disk.

Figure l'r'epresents a side machine;

Figure 2 represents a longitudinal section of the same; i

l `igure3represents a longitudinall section of the drill-carriage, showing the automatic ieed-ingdevices;

Figure 4-repi'esent's aptransvcrse section of fig. 3, taken on the-line a: x; and

F igure 5 represents a plan of the end of the drillcarriage.

Figure 6,l Sheet II, is a central longitudinal section of the bed on which the cylinders rest, and which is recessed to receivethe drill-carriage, the same showing the levers and cog-wheel, whereby the drill is rotated.

Figure 7 of said sheet is a face view of one of the cam-grooved disks, arranged at the outer ends of the cylinders.

Figure 8 is a transverse vertical scctionpfthe shell of one of the cylinders.

Figure 9 is an edge View of one of the end pieces of the cylinders.

Figure 10 is a kplan view of oneof the dividing plates.

elevation of my improved Figure 11, Sheet 1I, represents the inner side of one of the conical spring clamping-jaws, for holding and' operating the drill-rod, the spring and clamping-plate being shown in section.

Figure 12, Sheet II, is a perspective view of one of the clamping-jaws and its screw, which are arranged onor near the end of the drill-rod, opposite that on which the conical clamps are placed.

Figure 13, Sheet I, is a side view of the arrange- .ment of partswithn each of the cylinders part being broken away, to show the connection.

Figure 14, Sheet I, is a transverse vertical section of one ofthe pistons, and the rod against which their inner ends abut.

Figure 15, Sheet I, is a perspective view of one of the conical clamping-jaws. l

. Figure 16, Sheet I, is a face view of the clampingplate and its springs.

Figure 17, Sheet I, is a face viewof one of the two rings, between whiclrone 0f the sets of clamping-jaws is held.

Similar letters of refe-rence indicate corresponding paris. v

I employ a double rotary engine, of which A A' are the cylinders for imparting rotary motion tothe camwheel B, which .imparts reciprocating motion to the drill-carriage C. i

For economy of coustruction,.I form the `e11ginebcd into a casing for the drill-carriage.

The cylinders A A are fixedA to the bed in a concavity, and from -the-said concavity an opening fis made through the bed into the chamber, for the calnwheel to work through for contact` with the'drill-carringe,

I make the. shaft D of the engine hollow, and provide therein a rod. E, running from end to end, by which the ends of the cylinders are kept packed.

F represents the pistons, which are arrangedin slots in the shaft, opening into the tubular space therein, and they are provided with springs G, or other equivalent device arranged to force them out against the cylinders.

These pistons are rebated at their bases or inner ends, as shown in iig. 14, to afford a recess for the reception of the-rod E.

The effect of the spring G is that of a packing for the outer ends of the pistons, which are constantly in contact with the inner surface ofthe cylinder, during their revolution with the Shaft D and wheel B.

The ends T of the cylinders are concave, andthe sides of the pistons fitted thereto, so that no matter how much they wear, the pistons will always fit.

The ends T are rebated at their inner edges d', so as' to -receive Ithe shell ofthe cylinder.

H, (see iig. 7,) represents disks, applied to each end of -the shaft, and rotating with it, having cam-grooves H', which, in conjunction with the corresponding grooves, cam-grooves H2, in the hub of the wheel B, move the bridges or dividingplates I into and out of the path` of thepistons, for preventing the passage of the steam from the induction-ports Kto the exhausts L, the motion being communicated by the yokes I', connected to the dividing-plates, and so bent that their ends project into the grooves H of the plates and the grooves Hof the hubs respectively.

M represents the valve-chest of valve, for admitting'stcam to the ports K.-

'lhe said valve is operated by a vibrating arm, N,

' deriving motion from the cam-groove o, on the interior of the rim `of the wheel B.

The connection between said groove and arm is established by means of' a rod or bar, c, which has a right-angled end, fitting in the groove, and is provided at its opposite end with a stud or pin working in a slot in the arm N.

The valve-rod c is similarly connected to the lower end of said arm. 1

Ou the face of the cam-wheel are cam-projections P, into which studs u u on the drill-carriage take, and by which the motion is imparted to the carriage.

These cams are so formed that a stroke longer than the face of the'wheel maybe imiiarted to the drillcarriage.

They are also so formed that the connection between the wheel and the carriage is broken at the moment the blow of the drill is struck.

This is accomplished by so curving lthe projections that just previous to the contact of the drill, they re cede slightly and allow the drill to continue for a slight distance by its momentum. j

The drill-rod S is provided with a series of annular grooves, so formed as to resemble conical sections superposed upon one another, with the bases upward, and by these grooves the drill is suspendedl by two sets of spring jaws a. and b. (Sec figs. 3 and 15, Sheet I, and lig. 12, Sheet lI.)

These spring jaws are made in three or any other preferred number of pieces, having faces fitted to the coniignration of the drill, and they are contined to the drill-shank by elastic springs c, or bands of elastic ma terial.

lhe set c are suspended between a pair of rings d e, (see iigs. 3 and 17, Sheet 1,) clamped together by means of screw-threaded bolts and nuts, and capable of rising and falling to some extent in a hollow space `in one end of the drill-carriage. They are also provided with lateral armsf, projecting through slots in the walls of the drill-carriage.

The set b of clamping-jaws, (seefigs. o and 15, Sheet I, and fig. 11, Sheet 11,) are tapered at one end', and tted to work into the eye e' of a clampingplate, g, (see'tig. 19, Sheet 11,) having two a'rms projeeting into slots in the walls of the casing, as shown at 7i, lig. 2, just previous to the blow of the drill, whereby the plate is 4forced back upon the conical jaws, clamping them rapidly to the stemof the drill S, to hohl it during the deliveryof the blow.

The enlarged ends of the said jaws impart the blow to the drill by the action of the` shoulder k of the carriage thereon.

After the blow is struck, the plate g is forced away from the conical jaws 'Jy t-he springs g'.

Before the blow is delivered the arms f of the plate al arearrested in their movement with` the drill-rod, by striking against ledges or shoulder formed in the y walls of'the casing, and which causes the arrest of the jaws a, and they are, therefore, expanded by the force ofthe drill, and the latter' caused to pass through the distance of one notch. On the return movement a common slideof the drill-carriage,ythe arms of the plate c are also arrested at a point' suiiiciently in advance of that where the drill-carriage stops to force the drill-shank through the jaws b the distance of one notch.4

It will thus be seen that the ofiice of the tapered jaws i) is to form shoulders or bearing-surfhces for the shoulders Kl of the drill-carriage,l while the ofice of jaws/a is merely to feed the drill.

The jaws b are designed to enter the eye e of the plate g when or an instant before the blow is struck.

Without the aid of this plate the jaws b would 'not bear evenly and firmly ou the bases of the cones, in which case', owing to the heavy shock, the outer portions of said bases or shoulders of the cones would be liable to be split o'r broken otf. Other damages might also be caused by the want of this plate, which it is unnecessary to detail.

If the rock being drilled should be so hard that the drill is unable to move the distance of one of the cones or conical sections, there will, ofcourse, be no feed, as the jaws a do not in that case move back that distance. The feed will therefore be eected when the movement of the drill has been repeated, often enough to penetrate the rock the distance of one of the conical sections. The latter may be of any preferred length.

For the purpose of openingr the jaws to return the drill after it has been fed out, they are connected by screws l to cam-rings m, by passing through slots therein, and these cam-rings are connected to a bar,

u, for oscillating them in the direction, to cause the heads of the screws to ride up the inclines on the camrings, and thereby draw the jaws outwardly to open them suiiiciently to permit the drill-shank `to pass freely through the'm.

The bar a is operated by a key, q, and crank p.

The cam-rings may be operated by other equivalent devices.

4For turning the drill, it is provided with a toothed wheel, t,which has a spline-connection with the drill. As the latter is moved out, one of the teeth of the wheel will ride along the under side of the inclined` and pivoted sl'iring-lever al, thus turning the same, and with it the drill. On the return movelnent ofthe latter, the levers al and n will both be embraced be'- tween two of the teeth of the wheel, but so soon as the end ofthe long arm ofthe lever c is reached, another tooth of the wheel comes in contact with the under sidc of the fixed projection or rib a?, and the same is again ready to make its forward movement.

r.libe end X of thel drill-carriage may be weighted by rings y, placed thereon, and between the said rings au elasticcollar, Z, may be employed for tempering the shock against the carriage.

Having thus described my invention,

I claim as new fand desire to secure. by Letters Patent A 1. The combination with the cylinders and wheel B, provided with grooves H? of the rotary cam ,disks H, yokes l, and bridges, when arranged substantially as specified.

2. rlhe arrangement of the hollow shaft D, packing-rod E, cylinder-head' aml,camwheel, substantially as specified 3. The arrangement of the hollow shaft, tapered pistons F, concave piston-heads and springs G, substantially as specified. v

4. The combination with the drillcarriage, having projections rn. ot' the cam-projections l,`when the latter are formed to discontinue their act-ion upon the carriage previous to the blow of the drill, substantially as specified. A 5. The combination with the drill-shank, provided with grooves, as specified, of the spring clampingjaws of the cam-rings, pins, and jaws l, substantially as specified.

10. The combination with the cam-rings m, of the gar n, crank p, and key q, all substantially as speci- 1l. The combination with the drill-shank of the toothed-wheel t, projection a2, and spring-lever alyall arranged substantially as speoied.

Witnesses: A. BLATGHLY.

WILLIAM R. KENNEDY, HENRY S. TAPPAN. 

